Question

How is ‘Plaster of Paris’ manufactured?

Answer 1

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manufacturing plaster of Paris, gypsum was first crushed so that about 60% to 95% would pass through a 100 mesh sieve. This finely divided gypsum was then passed into a gypsum kettle which consisted of a steel cylinder set in brick-work and heated to temperatures ranging from 100 C. to 204 C. to remove about three quarters of the water of crystallization. The complete removal of water in combination was carefully avoided not react in the same manner as a partially dehydrated gypsum such as one containing about 25% of water of crystallization. A properly prepared plaster of Paris when mixed with water sets or hardens very promptly, this change being due to absorption of water, forming gypsum again..


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Answer 2

Plaster of paris is a white powder which is prepared by heating gypsum to a temperature of 373K.When gypsum is heated to a temperature of 373k ,It loses three-fourths of its water of crystallisation and forms plaster of paris. (from NCERT book class 10)
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